Three sorts of Bugs Bite Shield mosquito repelling patches contain high purity and high quality Citronella Oil, PMD (p-Menthane-3,8-diol), or Geraniol, which are effective, natural insect repellents. The pleasant scent emitted from the patches keeps mosquitoes away from you for up to 6 to 12 hours. It's the best choice for your mobile protection against mosquito bites.